Compound amine absorbent for absorbing sulfur dioxide and preparation method thereof

Abstract

The invention provides a composite amine absorbent for absorbing sulfur dioxide and a preparation method thereof, belonging to the field of gas purification and recovery, and the composite amine absorbent comprises the following components in percentage by mass: 30-50% of piperazine and derivatives thereof, 0.5-10% of an activator, 1-5% of a pH corrosion inhibiting solution, 0.1-0.5% of a defoaming agent and the balance of water. The preparation method comprises the following steps of: adding the piperazine and derivatives thereof, the activator, the pH corrosion inhibitor and the defoaming agent into the water according to a certain proportion, dissolving and stirring uniformly. The composite amine for absorbing the sulfur dioxide gas adopts the piperazine as an absorbent main body, and has the characteristics of low viscosity and strong sulfur dioxide absorption selectivity; the saturated absorption capacity can reach 2.6 mol / mol of amine, and the composite amine absorbent has a highdesorption capacity of 1.53 mol / mol. Compared with that of absorption solutions commonly used in industry, the desorption capacity of the composite amine absorbent after multiple absorption can stillreach more than 98%. In addition, the composite amine absorbent is added with a pH slow release liquid to reduce the corrosivity of the amine absorbent to equipment.

Description

technical field [0001] The invention belongs to the field of gas purification and recovery, and specifically relates to a composite amine absorbent for absorbing sulfur dioxide, which is mainly used for removing sulfur dioxide in industrial waste gases such as natural gas, coal gas, and flue gas. In addition, the invention also relates to the above-mentioned composite amine for absorbing sulfur dioxide Absorbent preparation method. Background technique [0002] SO 2 It is one of the main pollutants in the atmosphere and the source of acid rain. With the increasing requirements of environmental protection on the discharge of air pollutants, how to efficiently and reasonably select the desulfurization process in the process of purifying sulfur-containing industrial exhaust gas with low investment and operating costs to achieve the purpose of desulfurization, so that SO 2 It is the key issue for the sustainable development of various coal-fired power plants and metallurgical ...

AI Technical Summary

Problems solved by technology

[0004] Judging from the literature and patents published at home and abroad, the absorbents mainly composed of MEA and DEA with fast absorption rate are generally combined with absorption aids, preservatives, corrosion inhibitors, etc. to form a composite desulfurization absorption liquid, but its comprehensive absorption The sulfur capacity is generally low, the regeneration energy consumption is high, the equipment is highly corrosive, and the absorption rate of this type of composite absorbent will gradually decrease, which will affect the operation in practical application

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